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Performance Study of Various Adaptive filter algorithms for Noise Cancellation in Respiratory Signals

Author(s): A.Bhavani Sankar | D.Kumar | K.Seethalakshmi

Journal: Signal Processing : An International Journal
ISSN 1985-2339

Volume: 4;
Issue: 5;
Start page: 267;
Date: 2010;
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Keywords: Adaptive filter | Motion artifact | Power line interference | Least Mean Square (LMS) | Normalized LMS (NLMS) | Block LMS (BLMS)

Removal of noises from respiratory signal is a classical problem. In recent years, adaptive filtering has become one of the effective and popular approaches for the processing and analysis of the respiratory and other biomedical signals. Adaptive filters permit to detect time varying potentials and to track the dynamic variations of the signals. Besides, they modify their behavior according to the input signal. Therefore, they can detect shape variations in the ensemble and thus they can obtain a better signal estimation. This paper focuses on (i) Model Respiratory signal with second order Auto Regressive process. Then randomly generated noises have been mixed with respiratory signal and nullify these noises using various adaptive filter algorithms (ii) to remove motion artifacts and 50Hz Power line interference from sinusoidal 0.18Hz respiratory signal using various adaptive filter algorithms. At the end of this paper, a performance study has been done between these algorithms based on various step sizes. It has been found that there will be always tradeoff between step sizes and Mean square error.
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